PLUMMER, M.; CARSTENSEN, B. Lexis: An R Class for Epidemiological Studies with Long-Term Follow-Up. Journal of Statistical Software, [S. l.], v. 38, n. 5, p. 1–12, 2011. DOI: 10.18637/jss.v038.i05. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v038i05. Acesso em: 4 dec. 2022.